Photographing the dogs outside is a little like fishing: Find a promising stretch, make a cast, catch and release, move on," writes William Wegman in his introduction to Dogs on Rocks. For fans of Wegman's iconic pooch portraits, these soulful, playful, and slyly humorous shots of Weimaraners (Wegman's signature breed) vamping and lolling on the harshly beautiful Maine coast offer all the satisfactions of landing a big catch.